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What is phone brand and model?If the phone displays invalid sim card in screen it is locked to network,you need to unlock it.After unlock it you can use with any GSM network sim card in the phone.Without unlocking if you use other network sim card in the phone it will display invalid sim on screen.To get unlock code for GSM network locked phones visit the site Theunlockspot.com for iphones you can get remote unlocking service in the same site itself and unlock easily.

If your Nokia N95 displays invalid sim message on the screen,it's locked to network.You need to unlock it.Find the current network and country it is locked now .Get the unlock code for Nokia N95 from the site Theunlockspot.com and unlock it easily.After unlock it you can use any GSM network sim card in it.

If your Blackberry 8310 says Invalid sim card.It is locked to network.You need to unlock it from current network lock.So that you can use with other network....Without unlocking you cannot use other network sim card.Visit the site Simpleunlocking.com get unlock code and get free unlocking instructions at Mobileunlockguide.com and unlock it step by step.

A mobile will display a message as "Invalid SIM" if it is locked to a particular network. Hence a sim SIM card other than the compatible one is inserted, immediately it prompts Invalid SIM or Wrong SIM. To use other networks you first need to unlock the mobile. To unlock your mobile you can use the unlock code. Unlock code can be got from TheUnlockSpot.com once all your mobile information is submitted.

If the Nokia N70 says INVALID SIM means it locked to Network ,you need to Unlock it...Get the unlock code at here Classicunlocking.com and unlock the NOKIA N70 easily then use any GSM Network Sim card...

If you insert Sim it shows Invalid Sim means it locked to some Network,You need to Unlock it,You can get the free unlocking instructions from hereMobileunlockguide and get the Unlock code from here Superunlockcodes Then you can use any GSM Sim in the Phone,it will not show "INVALID SIM"